getting error when going to wordpress site

Hi,
I'm getting this error when trying to go to a client site:
Warning: require(/home/bnmpro5/public_html/baincil/wp-includes/rest-api/fields/class-wp-rest-meta-fields.php): failed to open stream: No such file or directory in /home/bnmpro5/public_html/baincil/wp-settings.php on line 238

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